function A(C) {
    return C
}

@A
    
class Malu{
    codeing() {
        console.log('正在打代码...');
    }
}
let info = {
    name: 'wc',
    child: {
        name: 'ml',
        age:18,
    }
}
console.log(info?.child?.age);
export default Malu;